The father-and-son stars of History’s “Pawn Stars” have been sued by a disabled Vietnam vet who claims they roughed him up in their Las Vegas shop last fall.

Daniel Callahan, 62, filed a civil suit in Clark County District Court on April 26 accusing Rick Harrison and his father, Richard, of physically assaulting him in their Gold & Silver Pawn Shop last October.

The suit was first reported by the syndicated TV show, “Right This Minute.”

According to the suit, Callahan — who walks with a cane — got into a dispute with the Harrisons, who placed him “in a chokehold, dragged him through the store and threw him onto the sidewalk” along with the Model 96B rifle he’d brought in to have appraised.

Callahan is asking for $20,000 in total damages, payment of his medical expenses related to the incident and payment of his legal fees.

“It’s my policy not to make statements early in litigation,” Callahan’s attorney, Craig Drummond, told The Post. John Taft, who represents the Harrisons, had no comment.